Notice of RetractionComparison of Biological Activated Carbon Filters Immobilized by Different-Source Bacteria

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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Two kinds of biological activated carbon filter (BACF), which were immobilized by high dehydrogenase activity (DHA) bacteria isolated from river water (H-BACF) and dominant bacteria from activated sludge (S-BACF), were set up to treat the river water. Results showed that dissolved-oxygen (DO) decrease of the filtrated water (compared with the influent water), bacterium number and DHA of carbon bed in H-BACF were more than that in S-BACF, and both increased with operation time. Scanning electron microscopy (SEM) indicated there was a better effect of immobilization in H-BACF compared to S-BACF. When the influent water was chemical oxygen demand (COD_Mn) 3.51-4.32 mg/L, total organic carbon (TOC) 4.705-12.700 mg/L, total nitrogen (TN) 4.705-12.700 mg/L, and UV254 0.066-0.114, the removal rates of H-BACF were 65.4%, 62.5%, 35.3% and 89.5%, higher than that of S-BACF (51.2%, 54.0% , 18.9% and 87.1%). Thus, the immobilization of high DHA bacteria from object source-water could improve likely bio film activity and treatment efficiency of BACF very well.